from dbutils.pooled_db import PooledDB
import pymysql

class MySQLhelper(object):
    def __init__(self, dbhost, dbport, dbuser, dbpassword, database):
        self.pool = PooledDB(
            creator=pymysql,  # 使用链接数据库的模块
            maxconnections=6,  # 连接池允许的最大连接数，0和None表示不限制连接数
            mincached=2,  # 初始化时，链接池中至少创建的空闲的链接，0表示不创建
            maxcached=5,  # 链接池中最多闲置的链接，0和None不限制
            maxshared=3,
            # 链接池中最多共享的链接数量，0和None表示全部共享。PS: 无用，因为pymysql和MySQLdb等模块的 threadsafety都为1，所有值无论设置为多少，_maxcached永远为0，所以永远是所有链接都共享。
            blocking=True,  # 连接池中如果没有可用连接后，是否阻塞等待。True，等待；False，不等待然后报错
            maxusage=None,  # 一个链接最多被重复使用的次数，None表示无限制
            setsession=[],  # 开始会话前执行的命令列表。如：["set datestyle to ...", "set time zone ..."]
            ping=1,
            # ping MySQL服务端，检查是否服务可用。# 如：0 = None = never, 1 = default = whenever it is requested, 2 = when a cursor is created, 4 = when a query is executed, 7 = always
            host=dbhost,
            port=int(dbport),
            user=dbuser,
            password=dbpassword,
            database=database,
            charset='utf8mb4'
        )

    def create_conn_cursor(self):
        conn = self.pool.connection(shareable=True)
        cursor = conn.cursor()
        return conn, cursor

    def fetch_all(self, sql, args):
        conn, cursor = self.create_conn_cursor()
        cursor.execute(sql, args)
        result = cursor.fetchall()
        cursor.close()
        conn.close()
        return result

    def insert_one(self, sql, args):
        conn, cursor = self.create_conn_cursor()
        res = cursor.execute(sql, args)
        conn.commit()
        cursor.close()
        conn.close()
        return res

    def update(self, sql, args):
        conn, cursor = self.create_conn_cursor()
        res = cursor.execute(sql, args)
        conn.commit()
        cursor.close()
        conn.close()
        return res

    def delete(self, sql, args):
        conn, cursor = self.create_conn_cursor()
        res = cursor.execute(sql, args)
        conn.commit()
        cursor.close()
        conn.close()
        return res

def get_sql_helper():
    #  本地环境
    return MySQLhelper(dbhost='localhost', dbport='3306', dbuser='root', dbpassword='admin', database='local_rpi')
    # 测试环境
    # return MySQLhelper(dbhost='172.17.0.1', dbport='3306', dbuser='test_shequn', dbpassword='test_shequn_2024', database='test_shequn')
    # return MySQLhelper(dbhost='localhost', dbport='3306', dbuser='root', dbpassword='admin', database='shequn_dev')
    # return MySQLhelper(dbhost='172.17.0.1', dbport='3306', dbuser='shequn', dbpassword='shanzhi_2024', database='shequn')
